#ifndef _APUE_H
#define _APUE_H

#define _XOPEN_SOURCE

#include <sys/types.h> /*Single UNIX Specification, Version 3*/
#include <sys/stat.h> /*some systems still require this*/
#include <sys/termios.h>  /*for winsize*/
#ifndef TOICGWINSZ
#include <sys/ioctl.h>
#endif
#include <stdio.h> /*for convenience*/
#include <stdlib.h> /*for convenience*/
#include <stddef.h> /*for offsetof*/
#include <string.h> /*for convenience*/
#include <unistd.h> /*for convenience*/
#include <signal.h> /*for SIG_ERR*/
#define MAXLINE 4096 /*max line length*/
/*
 *Default file access permission for new files
 */
#define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)

/*
 *Default permission for new directories
 */
#define DIR_MODE (FILE_MODE | S_IXUSR |S_IXGRP | S_IXOTH)

typedef void Sigfunc(int); /*for signal handlers*/
#if defined(SIG_IGN) && !defined(SIG_ERR)
#define SIG_ERR((Sigfunc *)-1)
#endif

#define min(a,b) ((a) < (b) ? (a) : (b))
#define max(a,b) ((a) > (b) ? (a) : (b))

/*
 *Prototypes for our own functions
 */
char *path_alloc(int *);
long open_max(void);
void clr_fl(int, int);
void set_fl(int, int);
void pr_exit(int);
void pr_mask(const char *);
Sigfunc *signal_intr(int, Sigfunc *);

int tty_cbreak(int);
int tty_raw(int);
int tty_reset(int);
void tty_atexit(void);
#ifdef ECHO /* only if <termios.h> has been included */
struct termios *tty_termios(void);
#endif

void sleep_us(unsigned int);
ssize_t readn(int, void *, size_t);
ssize_t writen(int, const void *, size_t);
void daemonize(const char *);

int s_pipe(int *);
int recv_fd(int, ssize_t (*func)(int, const void *, size_t));
int send_fd(int, int);
int send_err(int, int, const char *);
int serv_listen(const char *);
int serv_accept(int, uid_t *);
int cli_conn(const char *);
int buf_args(char *, int (*func)(int, char**));
int ptym_open(char *,int);
int ptys_open(char *);
#ifdef TIOCGWINSZ
pid_t pty_fork(int *, char*, int, const struct termios *, const struct winsize *);
#endif

int lock_reg(int, int, int, off_t, int, off_t);
#define read_lock(fd, offset, whence, len) \
	lock_reg((fd), F_SETLK, F_RDLCK, (offset), (whence), (len))
#define readw_lock(fd, offset, whence, len) \
	lock_reg((fd), F_SETLKW, F_RDLCK, (offset), (whence), (len))
#define write_lock(fd, offset, whence, len) \
	lock_reg((fd), F_SETLK, F_WDLCK, (offset), (whence), (len))
#define writew_lock(fd, offset, whence, len) \
	lock_reg((fd), F_SETLKW, F_WDLCK, (offset), (whence), (len))
#define un_lock(fd, offset, whence, len) \
	lock_reg((fd), F_SETLKW, F_UNLCK, (offset), (whence), (len))
pid_t lock_test(int, int, off_t, int, off_t);

#define is_read_lockable(fd, offset, whence, len) \
	lock_test((fd), F_RDLCK, (offset), (whence), (len) == 0)
#define is_write_lockable(fd, offset, whence, len) \
	lock_test((fd), F_WDLCK, (offset), (whence), (len) == 0)

void err_dump(const char *, ...);
void err_msg(const char *, ...);
void err_quit(const char *, ...);
void err_exit(int, const char *, ...);
void err_ret(const char *, ...);
void err_sys(const char *, ...);

void log_msg(const char *, ...);
void log_open(const char *, int, int);
void log_quit(const char *, ...);
void log_ret(const char *,...);
void log_sys(const char *, ...);

void TELL_WAIT(void);
void TELL_PARENT(pid_t);
void TELL_CHILD(pid_t);
void WAIT_PARENT(void);
void WAIT_CHILD(void);

#endif /* _APUE_H */
